Brake control



Jan. 24, 3928.

Ma/bw??? f n LGSZOE v. BENDIX BRAKE CONTROL Filed Aug. 15, 1924 3sheetsrshee-a 1 A una,

Jan. 24, 1928; LSLQQJ V. BENEHX BRAKE CONTROL Filed ma. 15, 1924 3shwrs-shew 2 Jam;n E4, MEM Ll V. Mmmm BRAKE CONTROL Filed Aug. l5, 19243 Sheets-52mm'. 5

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VINGENT BENDIX, OF CHICAG, ILLINOIS, ASSIGNOR TO BENDX BRAKE COMPANY,OF5 SQUTH BEND, INDIANA, A CORPOBATIGN OF LLINOIS.

BRAKE CONTROL.

appneauon inea .august i5, i924. serial no. 732,182.

This invention is concerned with a device for applying the brakes ofvehicles.

ldor applying the blakcs'of a light vchicle the customarymanually-operated 1inkage between the control pedal and the brakes issatisfactory, but for a heavy vehicle such as a` large'passenger bus orcommercial truck the, linkage mentioned is unsatisfactory because it isdiiiicult for theoperat-or to apply the brakes manually withsufficientforce to overcome, the moinentumwhen an abrupt stop isnecessary. V

, 'lho object of the invention is te provide a povmr-operated device ofimproved constructiem arrangement and operation. which is especiallyadapted for applying the brakes of heavy vehicles.

Other objects and advantages not specifically referred to will beappreciated upon an understandingl of the nature of the iii-- vention asdisclosed in the following detailed description and accompanying'drawings. wherein is presented two embodiments of the invention.

The invention is obviously susceptible of modification inunessentialgdetails of construct-ion, and the exemplifying embodimentspresented are accordingly not int-ended to restrict the spirit oftheinvention short of its comprehensive scope as defined in the appendedclaims.

ln the drawings, l

Fig. l is a side view of one form of the device;

Figi'. 2 is a top view of the same when not in operation;

lfig. $3 is a top view of the same when in operati on 4 y f1 is a sideview of another form of the device, and

Fig. 5 is a top view of the same when not in operation.

That form of the invention illustrated in Figs. 1, 2 and 3 of thedrawings will first be described.

er control pedal is pivoted at its lower end to a bracket 11 carried bya chassis menr ber 12, and a torque arm 13 is secured at its lower endto a rockshaft 1li journaled in a.

bracket 15 carried by another rearwardly spaced chassis member 16. Thearm 13 .is 'adapt-ed to be oscillated underthe control of the pedal 10by means hereinafter described, and the shaft 1li is caused by euchoscillation to impart the desired reciproeatingl movement to the usualbrake linkage connected with the saine.

A supporting member 17 is secured at its ends to the chassis members 12and 16, and carries in a concave seat 18 thereof a trans verselydisposed electric motor 19 which is tixedly positioned in the seat by acomplementary yoke 2O ren'iovably secured tothe same. A. small pinion2l. is secured to the armature shaft 22 of the motor 19, and meshes witha large gear 23 journaled on a shaft 21. The shaft 2dr is in turnjournaled in a portion of the supporting' member 17.l

One fac-e of the `gear 23 presents a dislelike friction'surface 25alongside which an annular friction mat 26 is positioned. rllhe mat 26is centered in floating relation to the friction surface by an annuiarshoulder 27 on the gear 225, but may be secured iixedly to 4the surface.The other face of the gear 23 is spaced from the adjacent side of thesupportingl member 17 by a thrust bezuring,` 28. A disk 29 is splined tothe shaft 211, and presents on one face thereof a friction surface 30normally spaced from. but frictionally engageable with, the frictionsurface 25 of the `ajear 23 through the intermediation of the frictionmat 26.- A collar 31 is secured to the adjacent end of the shaft 2a, andthe disk 29 is spaced from the collar by a thrust bearing` 32. lWhen themotor 19 is running and the disk 2.() is shifted axially in onedirection, the disk will frictionally engage with the rotating `ear 23and will tend to rotate the shaft 24 in a clockwise direction as viewedin Fig. 1.

A torque arm 33 is secured to the shaft 24 on that side of thesupporting member 12' opposite to the gear and disk assembly, and

. is nivotally connected at its upperend to a rod Bywhich is in turnpivotally connected 'to the upper end of the torque arm 13 on therockshaft 14. lVhen the shaft 2st is ro: tate-d a part of a revolutionas a result of frictional engagement between the gear 23 and the disk29, the torque arm 33 will transinit such oscillation to the rockshaft14 and the brakes will be operated by power derived from the motor 19. y

A bellcrank lever is pivoted to a laterai extension of the supportingmember 17.

4One end 36 of the lever 35 is positioned in alignment with the shaft2e, and is forked to bear at diainetrically opposed points against theadjacent. face 37 of the thrust bearing lli) 32. The other end 38 of thelever 35 is universally connected to a rod 39 which is in turn pivotallyconnected tothe control pedal at a point above the bracket 11. Anarcuate shoe 40 is provided onl the end 38 of the lever to depressacircuit-closing plunger 41 in a switchbox 42 of the circuit 4:3V of themotor` 19.l When the lever 35 is oscillated by the foot pedal 10, theshoe of the lever depressesgthe plunger 41 to start the motor 19, andtheen'd 36 of the lever forces the friction disk 29 axially into engagementwith the friction surface 25 `of the rotating gear 23.. f y

The operation of the device isas follows:

When the control pedal 10 is depressed by the operator to apply thevbrakes, the motor 19 will start, the `friction disk 29 will be forcedaxially into enga ement with the friction surface 25 of the. t enrotating gear 23, the shaft 24 will beoscillated by the powertransmitted thereto from the motor 19 throu h the gear 23 and the disk29, and

the rocks aftl: will be correspondingly oscillated through the torquearms 13 and 33 and the rod 34, wherebyto apply the brakes. When thepedal 10 is released. and permit;

ted to return to its normal position under 'the influence `of a suitablypositioned spring, @e motor 19 willcome to rest, the disk 29 will nolonger be forced against the friction surface of the then stationarygear, 23, and the shafts 24 and 14 will be permitted to return to theirnormal positions under the inuence of a suitably positioned spring 50. i

The device will deliver power from the motor to the brakes under themultiplica-4 tion of torque provided by the y inion v21 and the ear23,and will operate t e brakes 1 to any esired extent," dependent upon theextent to which the operator depresses the control pedal 1t).` Thedpower employed is from a source indepen` ent of the vehicle motor,andis consequently available at any time. f y y That form 4of theinvention illustrated in Figsnf and 5 differs fromthe first form in thatthe armature shaft of the motor and the shaft to which the disk 29 `isnonrotaty ably secured are concentrically arranged with the latter shaft44' within an axial bore of the armature shaftll; the pinion 21 and thegear 23 are eliminated, yand adisk* 46 is secured to the tubulararmatureshaft 45 and presents the friction surface 25 for coactionWith'the disk 29.

I claim: y

l. 'A power-operated device for applying brakes, including a linkage fortransmitting friction surface"30""of 'the .power to one or more brakes,a normally inactive electric motorya circuit-closing switch i forth'cmotor, a relatively small pinion on `the armature shaft of themotor, a shaft operated by the brake-applying through reduction gearingswitch and move the element for energizing the motor and effectingcoaction between the element and the gear, whereby to operate the brakeor brakes with power derived from the'motor.

2. A power-operated device for applying brakes, including a linkage fortransmitting power to one or more brakes,-a normally in-` activeelectric motor, a circuit-closing switch for the' motor, a relativelysmall pinion on the armature shaft ofthe motor, a shaft connected withthe linkage, a relatively large gear journaled on the latter shaft in1mesh with the pinion, a friction element splined on the latter shaft formovement axially thereof into coaction with a friction surface presentedby the gear, and manually-controlled means to close the switch and movethe friction element for energizing the motor and effectin coactionbetween the friction element and the friction surface of the gear,whereby to operate the brakes to any desired extent with power derivedfrom `the motor.

3. A manually-controlled power unit comprising,in combination, a motor,clutch ele ments, one of which is driven by the motor,

a torque arm connected to the'other clutch im) element and movablethrough an arcof less than 180, brake-operating means connected to thetorque arm, a brake pedal, and means the `brake pedal for forcing theclutch elements together. y y

4. A manuallyscontrolled power unit com prising, in'combination, amotor, a clutch i element driven by the motor and a coop eratingfreecl-utch element, a brake-apply `ing arm, a-torque arm connect clutchelement and substantie-ll parallel to arm, and movable through en arc ofless than 180, a rod con to the free necting the torque arm and thebrake-applying arm, and driver-controlled means for forcing the twoclutch elements together.

5. A power unit comprising, in coinbinai tion, a motor having a circuitincluding a switch, a clutch element driven by the motor y i and aco-operating clutch element, a pe al lever operated by the pedal forclosing the switch and `-forcing Vthe clutch elements together, and

means moved a relatively short distance by the clutch elements when theyare forced to -gether, `which means is thereafter urged in the samedirection by the Slipping of the clutch elements.

6. .Ani automobile brake-applying ower unit Icomprising, in combination,bra re-ap Vplying means, a supporting member ar- 1301 ranged to bridgetwo freine members in line wich the brake pedl, an eectro motor mountedon the supporting member, and menne operated by the motor nnci emendingletoray of the unit and controlled by the pedali to cause application ofthe brakenppiying means .by the electric motor..

7. Brake-applying means comprising, in combination, paiaiei crossmembers l2 and 1i@ i6, ai pedal 1U mounted on one member l2,

n brake-applying lever 13 mounted on he In testimony whereof havehereunto 20 signed my. name.

' VINCENT BENDX. Y

